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Difference between CPM and PERT

Difference between CPM and PERT

When it comes to network planning and project management, there are a few key terms that are important to know. Two of these terms are CPM (Critical Path Method) and PERT (Program Evaluation and Review Technique). While both methods are used for planning and managing projects, they have different purposes and benefits. In this blog post, we’ll take a closer look at the differences between CPM and PERT.
Which method is right for your project? Let’s find out!

What is CPM?

CPM (Critical Path Method) is a project management technique used to schedule and coordinate complex projects.

  • CPM was first developed in the 1950s by industrial engineer Roger W. Bates and has since been used on everything from construction projects to software development.
  • CPM is based on the principle of identifying the tasks that are critical to the completion of a project and then scheduling those tasks in a way that minimizes risk and ensures that the project is completed on time.
  • CPM is often used in conjunction with other project management tools, such as Gantt charts, to create a comprehensive picture of a project’s timeline. While CPM can be complex to understand and implement, it is an essential tool for managing large, complex projects.

What is PERT?

PERT is a technique that is used to evaluate and review programs. It was developed in the 1950s by the US Navy. PERT stands for Program Evaluation Review Technique. PERT is a network diagramming technique that uses nodes and arcs to represent activities and dependencies. PERT is used to schedule, coordinate, and control large-scale projects. PERT has been used on many high-profile projects, including the Apollo space program. PERT is a valuable tool for project managers because it helps to identify critical paths and potential bottlenecks. PERT can also be used to assess risks and create contingency plans.

Difference between CPM and PERT

CPM (Critical Path Method) and PERT (Program Evaluation Review Technique) are two popular methods for managing projects. Both CPM and PERT are designed to help project managers plan, schedule, and execute projects in an efficient and effective manner.

  • CPM is a deterministic approach that uses a fixed amount of time for each activity in the project schedule.
  • This makes CPM well suited for projects with well-defined task requirements.
  • CPM is also easy to use and understand, making it a popular choice for managing small- to medium-sized projects.
  • PERT, on the other hand, is a probabilistic approach that uses estimated time for each activity in the project schedule.
  • This makes PERT more flexible than CPM, as it can accommodate changes in the project plan more easily.

However, PERT can be more complex to use and understand, making it better suited for managing large or complex projects.


In conclusion, there is a big difference between CPM and PERT. Knowing which method to use for your project can make all the difference in its success.

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